.course_table{
    text-align: center;
    margin: 0 auto;
    border: black solid 1px;
    border-collapse:collapse;
}
.course_table tr th,.course_table tr td{
    text-align: center;
    border: black solid 1px;
}
.query{
    height: 100px;
    margin:0 auto;
}
.input{
    margin: 30px;
}
#btn{
    margin: 30px;
}
.normal_btn{
    float: left;
    margin: 13px 0px 0px 460px;
    height: 42px;
    width: 100px;
    border: none;
    font-weight: bold;
    background-color: #ff812b;
    text-align: center;
    color: #fff;
    font-size: 20px;
    font-family: "Microsoft YaHei";
    cursor: pointer;
}
.table_in_input,.tcb,.mcb{
    border: rgba(0, 0, 0, 0) solid 1px;

    display: block;
    width: 100%;
    text-align: center;
}

.display_none{
    display: none;
}
.display_block{
    display: block;
}
.btn_container{
    margin:0 auto;
}